Incorrect synchronization in DistributedCache causes TaskTrackers to freeze up
during localization of Cache for tasks.
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Key: HADOOP-6249
URL: https://issues.apache.org/jira/browse/HADOOP-6249
Project: Hadoop Common
Issue Type: Bug
Components: filecache
Affects Versions: 0.20.0
Reporter: Sreekanth Ramakrishnan
Currently {{org.apache.hadoop.filecache.DistributedCache.getLocalCache(URI,
Configuration, Path, FileStatus, boolean, long, Path, boolean)}} allows only
one {{TaskRunner}} thread in TT to localize {{DistributedCache}} across jobs.
Current way of synchronization is across baseDir this has to be changed to lock
on the same baseDir.
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